PHP生成短网址的3种方法代码实例

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短网址服务，可能很多朋友都已经不再陌生，现在大部分微博、手机邮件提醒等地方已经有很多应用模式了，并占据了一定的市场。估计很多朋友现在也正在使用。 看过新浪的短连接服务，发现后面主要有6个字符串组成。

太多算法的东西，也没必要去探讨太多，最主要的还是实现，下面是三种方法的代码：

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<>PHP 
//纯随机生成方法

function random($length,$pool = '')

{

$random = ''; 
if (empty($pool)) { 
  $pool  = 'abcdefghkmnpqrstuvwxyz'; 
  $pool  .= '23456789'; 
} 

srand ((double)microtime()*1000000); 

for($i = 0; $i < $length; $i++) 
{ 
  $random .= substr($pool,(rand()%(strlen ($pool))),1); 
} 

return $random; 
} 
$a=random(6);

print_r($a);  
// 枚举生成方法

function shorturl($input) {

$base32 = array (

"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"

); 
$hex = md5($input);

$hexLen = strlen($hex);

$subHexLen = $hexLen / 8;

$output = array(); 
for ($i = 0; $i < $subHexLen; $i++) {

$subHex = substr ($hex,$i  8,8);

$int = 0x3FFFFFFF & (1  ('0x'.$subHex));

$out = ''; 
for ($j = 0; $j < 6; $j++) {

$val = 0x0000001F & $int;

$out .= $base32[$val];

$int = $int >> 5;

} 
$output[] = $out;

} 
return $output;

}

$a=shorturl("//code.js-code.com");

print_r($a);

//62 位生成方法
function base62($x) 
{ 
$show= ''; 
while($x> 0) { 
$s= $x% 62; 
if($s> 35) { 
$s= chr($s+61);       
} elseif($s> 9 && $s<=35) { 
$s= chr($s+ 55); 
} 
$show.= $s; 
$x= floor($x/62); 
} 
return $show;   
} 
function urlShort($url) 
{ 
$url= crc32($url); 
$result= sprintf("%u",$url); 
return base62($result); 
} 
echo urlShort("//code.js-code.com/"); 
?>

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